EP 0023245 A1 19810204 - Light pen.
Title (en)
Light pen.
Title (de)
Lichtgriffel.
Title (fr)
Crayon photosensible.
Publication
Application
Priority
GB 7926203 A 19790727
Abstract (en)
A light pen for detecting radiation from a display screen has a tubular body with a conical tip (1). The tip which fastens into the pen body includes an opaque bush (4) which has a bore (5) having a precisely determined diameter for transmitting light from an aperture in the tip to a light sensing device mounted in the body of the pen. The bore or interior surface of the bush has a surface formed to eliminate internal reflection.
IPC 1-7
IPC 8 full level
G06K 7/10 (2006.01); G06F 3/037 (2013.01); G06K 9/24 (2006.01)
CPC (source: EP)
G06F 3/03542 (2013.01)
Citation (search report)
- US 3586861 A 19710622 - WERNIKOFF ROBERT E
- DE 2413488 A1 19751002 - SIEMENS AG
- US 1546264 A 19250714 - STORY JR WILLIAM E
- ELEKTRONIK, Vol. 1, 1975, Munich, DE, G. GIDL: "Digitale-Positionierung auf dem Bildschirm", pages 61-67 * Page 63 "Lichtgreiffel" *
- IBM TECHNICAL DISCLOSURE BULLETIN, Vol. 12, No. 6, November 1969, New York, US, R.G. GRAY: "Optical funnel for light pen", page 800 * The whole document *
- IBM TECHNICAL DISCLOSURE BULLETIN, Vol. 13, No. 2, July 1970, New York, US, J.C.GREESON: "Computer light pen" page 502 * The whole document *
- IBM TECHNICAL DISCLOSURE BULLETIN, Vol. 15, No. 5, October 1972, New York, US, R.B. JOHNSON: "Fiberoptic probe actuate switch", page 1474 * The whole doccument *
Designated contracting state (EPC)
CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0023245 A1 19810204; BR 8004718 A 19810210; CA 1155984 A 19831025; GB 2055192 A 19810225; GB 2055192 B 19830407; IL 60394 A0 19800916; JP S5621227 A 19810227; JP S5842489 B2 19830920
DOCDB simple family (application)
EP 80102561 A 19800509; BR 8004718 A 19800728; CA 357088 A 19800725; GB 7926203 A 19790727; IL 6039480 A 19800625; JP 9337380 A 19800710